Improvement in coil steam-generators



W. S. SALISBURY. Coil Steam Generator.

Patented Feb. 19, I878} 0 a. a d 6 Z a 0 W N-PETERS, FHOTO-LITMOGRAFHEFLWASHINGTON. D C,

, UNITED "STATE-S PATENT OFFICE.

WILBER S.- SALISBURY, OF BATTLE CREEK, MICHIGAN, ASSIGNOR OF ONE- HALFHIS RIGHT TO HENRYJ. BRIMMER, OF ADAMS, NEW YORK.

IMPROVEMENT IN COIL STEAM-GENERATORS.

Specification forming part of Letters Patent No. 200,482, dated February19, 1878; application filed February 10, 1877.

To all whom it may concern: I

Be it known that I, WILBER S. SALISBURY, of Battle Creek, in the countyof Calhoun and State of Michigan, have invented certain new and usefulImprovements in Steam-Generators; and I do hereby declare that thefollowing is a full, clear, and exact description thereof, which willenable others skilled in the art to which it pertains to make and usethe same, reference being had to the accompanying drawings, and to theletters of reference marked thereon, which form a part of thisspecification, and, with the accompanying detailed description, setforth what I consider the best means of carrying out my invention.

Figure 1 is a central vertical section, and Fig. 2 is a plan View withthe top parts removed.

Similar letters of reference indicate like parts in both the figures.

D is a continuous coil of lap-welded iron or other pipe, supplied with aT at each end, and inside of which and throughout its length is a coil,0, of pipe, considerably less in diameter, having small holes drilledthrough at various distances apart {in the lower coils, and suppliedwith water through an end, 0. In the passage of water through coil 0 itis sprayed through the small holes into the larger coil D, and becomesinstantly converted into steam, which, being separated from the water,passes upward and out of steam-pipe I, and in its ascent it heats thefeed-water in coil 0. The T on the lower end of coil D is provided witha piston, H, and connecting-rod N.

When the water rises above the lower coil it will lift the piston H,which, bythe means of the connecting-rod N, opens valve L, allowing thewater to escape at J, thereby automatically controlling the flow ofwater, so that all water not converted into steam before it reaches theend of coil 0 may pass out through valve L. Below the bottom of thecoils is a circle of firebrick, K, held in an ordinary cast-iron frame,and which need differ in no respect from the ordinary fire brick workaround a circular grate, only to give a greater diameter than the coil1). The coils should have suitable supports to raise them above thefire-brick, for

free passage of combustion under the lower coil. V A cylindrical casing,A, of stout sheet-iron, incloses the coils, which is provided with aconical extension thereof at the top, and a chimney, A also a'circularvalve, E, coverin g holes that are made through the lower part for draftof air. In the interior of coil D is a cylindrical casing, B, providedwith a conical extension thereof at the top, and provided with achimney, B and with a turning valve, F, attached to which are threechains, Gr, that pass through the outer casing and down the outside ofsame to connect on thecircular valve E, thus suspending the casing B,and when the circular valve E is raised the casing B is lowered down soas to rest upon the fire-brick K. At the same time valve F is thrownopen by suitable connection, (not represented,) thus effectuallyshutting off the fire from the coils, which ascends up through casing Band chimney B while the coils become cooled off from the draft of airrushing in through the holes in the lower part of casing A, and passingout through the chimney A When the casing B is elevated and the valve Fis closed, thehot products of combustion rising from the fire on thegrate are imprisoned and prevented from any egress through the chimney Band are compelled to dive under the lower edge of casing B, and passupward among the convolutions of pipe D and outv through the chimney AThe spaces between the convolutions should be ample for free egress ofall gases rising from combustion. The valve F should be shaped to closeas tight as possible, so as to. efiectually prevent any gases fromascending when closed, and may be so arranged as to work automaticallywith the raising and lowering of the casing .B and valve F.

The pipes D and C may contain as many coils as are required for more orless power of boiler. An outer casing (not represented) of thin metal,exterior to casing A, may be used to protect persons from heat.

The water should be nearly all evaporated in being driven through thecoils. In using very pure water it may be taken into the feed pump, (notrepresented,) and compelled to repeat its rounds several times. Withhard or muddy water, it should be allowed to escape and waste.

Many modifications may be made in the details of the apparatus, and someof the features of the invention may be used without the whole. I attachimportance to the arrangement of the pipe D, in having the pipe 0 coiledinside, as a means of separating the water from the steam; also, inproviding a steam-chamber, so as to more eifectually dry the steam. Ialso attach importance to the steam heating the feed-water in itspassage through pipe 0 also, to the open end of pipe 0', and inconnection with valve L, as a means of freeing the pipe fiom anysediment; also, to the piston H and connecting-rod N, as a means ofautomatically operating valve L, thereby preventing too much water beingpumped in when running the engine at a high rate of speed; also, to theautomatic arrangement of the interior casing B and circular valve E, asa means of protecting the coils from too intense heat, which might bedestructive, especially when the engine is stopped and the fire is infull glow.

I claim as my invention 1. The inner casing B, chimney B,connecting-chains G, and turning valve F, in connection with casing Aand circle-valve E, all in gOllblllflfiOIl with a coil-boiler, as hereinspeci- 2. A coil-boiler consisting of a double coil, one coil of lessdiameter than, and located within theinterior of, the other, said innercoil or pipe being partially perforated, as described and shown.

3. A coil-boiler with a double coil, one located within the interior ofthe other, said inner coil conducting and heating the feed-water,'incombination with branches or T-pieces, the lower one of said branchesbeing provided with piston H and valve L, by means of which the water'inthe coil is kept at a proper height, all constructed and arrangedsubstantially as shown and described.

I WILBER S. SALISBURY.

Witnesses:

F. R. PARKER, JAS. ADAMS.

